<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>websocket客户端</title>
</head>
<body>

<script type="text/javascript">
    var socket;

    if (window.WebSocket){
        socket = new WebSocket("ws://localhost:8899/ws");
        socket.onmessage = function (ev) {
            var ta = document.getElementById("responseText");
            ta.value = ta.value + "\n" +ev.data;
        }
        socket.onopen = function (ev) {
            var ta = document.getElementById("responseText");
            ta.value = "连接开启！";
        }
        socket.onclose = function (ev) {
            var ta = document.getElementById("responseText");
            ta.value = ta.value + "\n" + "连接关闭！";
        }
    } else{
        alert("浏览器不支持websocket！");
    }


    function send(message) {
        if (!window.WebSocket){
            return;
        }
        if (socket.readyState == WebSocket.OPEN){
            socket.send(message);
        } else{
            alert("连接尚未开启！");
        }
    }

</script>

<form onsubmit="return false;">
    <textarea name="message" style="width: 400px; height: 200px"></textarea>
    <input type="button" value="发送数据" onclick="send(this.form.message.value)">

    <h3>服务端输出：</h3>

    <textarea id="responseText" style="width: 400px; height: 300px"></textarea>
    <input type="button"  onclick="javascript:document.getElementById('responseText').value=''" value="清空内容">
</form>

</body>
</html>